Color calibration of color image rendering devices

  • US 8,638,340 B2
  • Filed: 05/05/2010
  • Issued: 01/28/2014
  • Est. Priority Date: 02/26/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for correcting errors of color reproduction due to non-uniform rendering upon a surface by an output device having a plurality of color channels, said apparatus comprising:

  • optics for forming an image of said surface;

    an array sensor for converting said image into electrical signals, wherein said electrical signals are useable to produce digital image data that are corrected for spatial non-uniformity of image capture by said optics and said array sensor; and

    a controller, or a plurality of processors operating in conjunction, which produces information from said digital image data from said electrical signals of said array sensor enabling said controller or said plurality of processors operating in conjunction to detect non-uniform rendering of brightness or color along said surface and to determine spatial correction functions for said color channels which enable rendering with uniformity of brightness and color along said surface in accordance with said information from said digital image data, wherein said apparatus is calibrated to enable colorimetric capture of said image of said surface, and said spatial correction functions are determined responsive to effects of interactions between color channels in said device on rendering brightness and color across said surface.

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